<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>元素类型转换</title>
    <style>
        span{
            width: 100px;
            height: 100px;
            background: yellow;
            position: absolute;
        }
    </style>
</head>
<body>
    <!-- 
        1.  position: absolute;
        2.  display: block;
        3.  float: left
    -->
    <span>hello</span>
</body>
</html>